Where's a good place to get 12v behind the head unit?

Sargentmyself · 11-12-2020, 03:56 AM

Looking to install a wireless backup camera receiver and I need 12v behind the head unit and from the reverse lights. Finding 12v from the reverse light should be easy enough once I can figure out how to get the light out but I'm not sure about behind the head unit.

Trying to tap into the head unit power seems like a bad idea, radio equipment can be pretty picky about its power source so I was thinking the climate control power. Does anyone know what pins I would be looking for to splice into? Or a better option?

Thanks

lnxguy · 11-13-2020, 07:25 AM

Just tap the red(+green?) 12V wire going into the headunit. It's your best bet. Check out the $130 DIY backup cam thread for details in the Nav/ConnectedDrive forum.

bluewater328 · 11-14-2020, 02:13 AM

If you want to be sure, just tap off the fuse box behind the glove box. You can use a piggyback fuse. You can reference the chart that is literally on the opposite side of your glove box rear panel.

You rear camera can tap off the same wiring to the lights. If it needs decent power you may have to run a relay with the reverse light as a trigger and taking constant straight off the battery.

Search for reverse cam in this area of the forum. We've discussed the setup a few times. I'd point you but I can't seem to find my bookmark on it.

Try this one out...its not the one I'm thinking of, but has similar info: https://www.e90post.com/forums/showt...camera+install

11-12-2020, 03:56 AM	#1
Sargentmyself New Member 2 Rep 14 Posts Drives: e92 335i xdrive Join Date: Jul 2018 Location: Alberta iTrader: (0)	Where's a good place to get 12v behind the head unit? Looking to install a wireless backup camera receiver and I need 12v behind the head unit and from the reverse lights. Finding 12v from the reverse light should be easy enough once I can figure out how to get the light out but I'm not sure about behind the head unit. Trying to tap into the head unit power seems like a bad idea, radio equipment can be pretty picky about its power source so I was thinking the climate control power. Does anyone know what pins I would be looking for to splice into? Or a better option? Thanks
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11-13-2020, 07:25 AM	#2
lnxguy Lieutenant Colonel 357 Rep 1,723 Posts Drives: 2009 335D Join Date: Jun 2016 Location: Barrie iTrader: (1)	Just tap the red(+green?) 12V wire going into the headunit. It's your best bet. Check out the $130 DIY backup cam thread for details in the Nav/ConnectedDrive forum. __________________ '09 335D Last edited by lnxguy; 11-13-2020 at 07:33 AM..
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11-14-2020, 02:13 AM	#3
bluewater328 Colonel 626 Rep 2,099 Posts Drives: 2011 bluewater 328i LCI sedan Join Date: Aug 2010 Location: Hawaii iTrader: (0)	If you want to be sure, just tap off the fuse box behind the glove box. You can use a piggyback fuse. You can reference the chart that is literally on the opposite side of your glove box rear panel. You rear camera can tap off the same wiring to the lights. If it needs decent power you may have to run a relay with the reverse light as a trigger and taking constant straight off the battery. Search for reverse cam in this area of the forum. We've discussed the setup a few times. I'd point you but I can't seem to find my bookmark on it. Try this one out...its not the one I'm thinking of, but has similar info: https://www.e90post.com/forums/showt...camera+install
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